Handlebar stem

Abstract

A handlebar stem for bicycle handlebars has a stem element connected to a holding element. The holding element has a tube opening and surrounds a steer tube in the mounted state. A clamping element is arranged in the holding element. Using a clamping device, a clamping force is exerted on the clamping element for fixing the handlebar stem to the steer tube.

What is claimed is: 
     
       1. A handlebar stem comprising:
 a holding element for connection to a steer tube, the holding element enclosing the steer tube at least in part, 
 a stem element connected to the holding element, and 
 a clamping element arranged inside the holding element, a clamping force for the fixation of the handlebar stem to the steer tube acting on the clamping element via at least one clamping screw which is at least partly arranged in the holding element, 
 wherein the holding element has two adjacent thickenings that, in the mounted state, are arranged vertically above each other, 
 wherein at least one clamping screw is arranged in each thickening, and 
 wherein the clamping element has at least one protrusion which, in the mounted state, protrudes into a recess of the holding element, the recess being arranged between the two adjacent thickenings of the holding element. 
 
     
     
       2. The handlebar of  claim 1 , wherein the at least one clamping screw directly generates the clamping force substantially acting orthogonally relative to the steer tube. 
     
     
       3. The handlebar of  claim 1 , wherein a tube contact surface of the clamping element is shaped concavely, and wherein, in the mounted state, the tube contact surface is in contact with the steer tube. 
     
     
       4. The handlebar of  claim 3 , wherein the tube contact surface has a radius corresponding to a radius of the steer tube. 
     
     
       5. The handlebar of  claim 1 , wherein the clamping element has a substantially crescent-shaped cross section. 
     
     
       6. The handlebar of  claim 1 , wherein the at least one clamping screw is arranged in a rear side of the holding element. 
     
     
       7. The handlebar of  claim 1 , wherein the holding element has a tube opening which, in the mounted state, completely circumscribes the steer tube. 
     
     
       8. The handlebar of  claim 1 , wherein the at least one clamping screw is a stud screw or a grub screw. 
     
     
       9. The handlebar of  claim 1 , wherein the stem element is formed integrally with a handlebar. 
     
     
       10. The handlebar of  claim 9 , wherein the handlebar is a racing bicycle handlebar. 
     
     
       11. The handlebar of  claim 1 , wherein the holding element is not slit.